| Symptom | Likely Cause | Fix | |---------|--------------|-----| | | Typo or old key format | Double‑check the 25‑character string; copy‑paste from the email. | | Activation dialog keeps re‑appearing | Corrupt kutools.lic file | Close Excel → Delete the file located at %AppData%\Kutools\kutools.lic → Restart Excel and re‑activate. | | Features still greyed out | Offline mode (no internet) | Ensure the machine can reach license.kutools.net (port 443). | | License shows as “Expired” even after renewal | Cache issue | Run Kutools → Options → Clear License Cache , then re‑activate. | | Error 502 – Server Unavailable | Kutools server maintenance | Wait 5‑10 minutes; the licensing service is highly available but occasional patches happen. |
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